Optus has activated number share for Samsung Galaxy Watch. Even though they have not made it official yet, I can confirm that it is working.
You need to make sure you have updated your watch software to the latest version.
There is no support from customer service as yet as even they have no idea it has been activated.
Optus is offering 12 month number share free and then $5/month.
How do you know its 12 months free if no support from CS?